General Safety Information
WARNING
Note
• Adjust the RD-C201 reverse spring type rear derailleur from the low side.
• If gear shifting operations do not feel smooth, wash the derailleur and lubricate all
moving parts.
• If the amount of looseness in the links is so great that adjustment is not possible, you
should replace the derailleur.
• You should periodically clean the derailleur and lubricate all moving parts (mechanism
and pulleys).
• If gear shifting adjustment cannot be carried out, check the degree of parallelism at the
rear end of the bicycle. Also check if the cable is lubricated and if the outer casing is
too long or too short.
• If you hear abnormal noise as a result of looseness in a pulley, you should replace the
pulley.
• If the wheel becomes stiff and difficult to turn, you should lubricate it with grease.
• Do not apply any oil to the inside of the hub, otherwise the grease will come out.
• You should periodically wash the sprockets in a neutral detergent and then lubricate
them again. In addition, cleaning the chain with neutral detergent and lubricating it can
be a effective way of extending the useful life of the sprockets and the chain.
• If the chain keeps coming off the sprockets during use, replace the sprockets and the
chain.
• Always be sure to use the sprocket set bearing the same group marks. Never use in
combination with a sprocket bearing a different group mark.
• Use a frame with internal cable routing is strongly discouraged as
it has tendencies to impair the SIS shifting function due to its high
cable resistance.
• Use an outer casing which still has some length to spare even
when the handlebars are turned all the way to both sides.
Furthermore, check that the shifting lever does not touch the
bicycle frame when the handlebars are turned all the way.
• Grease the inner cable and the inside of the outer casing before
use to ensure that they slide properly.
• Operation of the levers related to gear shifting should be made only when the front
chainwheel is turning.
• Parts are not guaranteed against natural wear or deterioration resulting from normal use.
• For maximum performance we highly recommend Shimano lubricants and maintenance
products.
• For any questions regarding methods of installation, adjustment, maintenance or
operation, please contact a professional bicycle dealer.
• Check that the wheels are fastened securely before riding the bicycle. If the wheels are
loose in any way, they may come off the bicycle and serious injury may result.
• Use neutral detergent to clean the chain. Do not use alkali-based or acid based
detergent such as rust cleaners as it may result in damage and/or failure of the chain.
• Use the reinforced connecting pin only for connecting the narrow type of chain.
• There are two different types of reinforced connecting pins available. Be sure to check
the table below before selecting which pin to use. If connecting pins other than
reinforced connecting pins are used, or if a reinforced connecting pin or tool which is
not suitable for the type of chain is used, sufficient connection force may not be
obtained, which could cause the chain to break or fall off.
• If it is necessary to adjust the length of the chain due to
a change in the number of sprocket teeth, make the
cut at some other place than the place where the chain
has been joined using a reinforced connecting pin or
an end pin. The chain will be damaged if it is cut at a
place where it has been joined with a reinforced
connecting pin or an end pin.
• Check that the tension of the chain is correct and that the chain is not damaged. If the
tension is too weak or the chain is damaged, the chain should be replaced. If this is
not done, the chain may break and cause serious injury.
• Obtain and read the service instructions carefully prior to installing the parts. Loose,
worn, or damaged parts may cause injury to the rider.
We strongly recommend only using genuine Shimano replacement parts.
• Read these Technical Service Instructions carefully, and keep them in a safe place for
later reference.
Series
Rapidfire Plus
Outer casing
Rear derailleur
Type
Freehub
Gears
Cassette sprocket
Chain
Bottom bracket guide
Technical Service Instructions SI-0027B
In order to realize the best performance, we recommend that the following
combination be used.
g
a
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18
T
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S
H
I
M
A
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O
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Y
P
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R
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L
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C
a
g
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1
5
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a
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1
3
T
Group marks
Specifications
Model number
Type
Total capacity
Largest sprocket
Smallest sprocket
Front chainwheel tooth difference
Rear Derailleur
Chain toolChain
9-speed super narrow chain
such as
CN-7701 / CN-HG93
8- / 7- / 6-speed narrow
chain such as
CN-HG50 / CN-IG51
Reinforced
connecting pin
TL-CN32/TL-CN23
TL-CN32/TL-CN23
6.5mm
7.1mm
Silver
Black
Rear Drive System
Reinforced Connecting Pin
End Pin Link Pin
Gear shifting operation
Both lever (A) and lever (B) always return to the initial position when they are released after shifting.
When operating one of the levers, always be sure to turn the crank arm at the same time.
To shift from a large sprocket to a smaller sprocket
(Lever A)
To shift one step only, press lever (A) to the (1) position. To shift
two steps at one time, press to the (2) position.
To shift from a small sprocket to a larger sprocket
(Lever B)
Press lever (B) once to shift one step from a smaller to a larger
sprocket.
Mounting the shifting lever
Use a handlebar grip with a maximum
outer diameter of 32 mm.
5 mm Allen key
Allen key tightening torque:
6 - 8 N·m {53 - 69 in. lbs.}
Replacement of the freewheel body
After removing the hub axle, remove the
freewheel body fixing bolt (inside the
freewheel body), and then replace the
freewheel body.
Note:
Do not attempt to disassemble the
freewheel body, because it may result
in a malfunction.
Tightening torque:
35 - 50 N·m {305 - 434 in. lbs.}
Freewheel body
Freewheel body washer
Freewheel body fixing bolt
Disassembly
Assembly
10 mm Allen key
(TL-WR37)
Installation of the sprockets
Sprockets Group name
an8
Model number
CS-HG50-8I
Tooth combination
11, 13, 15, 17, 20, 23, 26, 30T
Cassette sprocket tooth combination
ao8CS-HG40-8I 11, 13, 15, 17, 20, 23, 26, 34T
Lever (B)
1
2
Lever (A) initial
position
ST-EF50-8RT
SIS
RD-C201
MGS
FH-RM30-8
8
CS-HG50-8I / CS-HG40-8I
CN-HG50
/ CN-HG40
SM-SP18 / SM-BT18
Altus
SIS Adjustment
Installation of the chain
Install the chain with the Pro-Set alignment block still attached.
After installing, remove the Pro-Set alignment block.
Turn the crank arm to set the derailleur to the low position.
Note:
Be sure that the cable is securely in
the groove.
Groove
Connect the cable to the rear derailleur and, after taking up the
initial slack in the cable, re-secure to the rear derailleur as shown
in the illustration.
Pull
4. SIS adjustment
Push lever (B) while turning the crank arm to move the derailleur to the largest
sprocket. Then operate lever (A) once to move the derailleur to the 2nd-gear
sprocket. After this, operate lever (A) just as far as the extent of play, and then turn
the crank arm.
Tightening torque:
5 - 7 N·m {44 - 60 in. lbs.}
When changing to 3rd
Turn the cable adjustment bolt clockwise to
tighten it until the chain returns to the 2nd
sprocket.
Best setting
The best setting is when the cable adjustment bolt is tightened (turned clockwise)
until noise occurs without lever (A) being operated, and then loosened (turned
counterclockwise) 90 - 180 degrees from that point.
Operate lever (A) to change gears, and check that no noise occurs in any of the
gear positions.
When no noise is heard at all
Turn the cable adjustment bolt
counterclockwise to loosen it until the
chain touches a sprocket and generates
noise.
For the best SIS performance, periodically lubricate all power-transmission parts.
1
1 2
2
2. Top adjustment
Turn the crank arm while pulling the derailleur with your
hand to move the derailleur to the top position, and
then turn the top adjustment screw to adjust so that the
guide pulley is in line with the outer line of the smallest
sprocket when looking from the rear.
Turn the crank arm to set the derailleur to the low
position.
3. Securing the outer cable and inner cable
Operate lever (B) at least 7 times to set the lever to the
lowest position.
Remove the screw, and then remove the cover.
Pull out the inner cable as shown in Figure, and then
install the new inner cable.
1. Low adjustment
Turn the low adjustment screw so that the guide pulley
moves to a position directly in line with the largest
sprocket.
Guide pulley
Low adjustment
screw
Largest
sprocket
Inserting the inner cable
Insert the inner cable into the outer casing from the end with the
marking on it. Apply grease from the end with the marking in
order to maintain cable operating efficiency.
Marking
1
2
1 2
Guide
pulley
Outer line of smallest
sprocket
Top
adjustment
screw
Tightening torque:
0.3 - 0.5 N·m {3 - 4 in. lbs.}
Cutting the outer casing
When cutting the outer casing, cut the opposite end to the end
with the marking. After cutting the outer casing, make the end
round so that the inside of the hole has a uniform diameter.
Attach the same outer end cap to the cut
end of the outer casing.
Outer end cap
Place the outer casing so that it does not touch the basket and mudguard, otherwise it may
cause a problem with the performance of the derailleur.
Set the outer casing so that its length is as follows.
Add 10 mm to the length of the outer casing from the end that
is inserted into the outer casing holder to the end which is
inserted into the link.
•If routing the casing upward:
(The chain should be on the largest chainring and on the largest sprocket.)
Set the length of the outer casing so that it describes a
smooth arc, and so that the link stops in a position where
there is a small gap between the link and the link stop.
•If routing the casing downward:
(The chain should be on the largest chainring and on the largest sprocket.)
Outer casing
holder
Add 10 mm
Link
Link
Link stop
Largest
sprocket
Largest
chainring
Chain position
Largest
sprocket
Largest
chainring
Chain position
Connect the inner cable to the derailleur
as shown in the illustration.
Pro-Set alignment block
Inner cable
Lever (B)
Cover
Screw
Frame
Bracket bolt
Bracket nut
Installation of the rear derailleur
Direct-mount type
Push in and
tighten
Tightening torque:
8 - 10 N·m {70 - 86 in. lbs.}
5 mm Allen Key
Bracket type
Tightening torque:
3 - 4 N·m {26 - 34 in. lbs.}
Bracket
RD-C201
MGS
43T
34T
11T
20T
Inner cable
adjustment bolt adjustment bolt
23
23
23
23
Chain length
Add 2 links (with the chain on both the largest sprocket and
the largest chainring)
Chain
Largest sprocket Largest chainring
For each sprocket, the
surface that has the group
mark should face outward
and be positioned so that
the triangle (
U) mark on
each sprocket and the A
part (where the groove
width is wide) of the
freewheel body are aligned.
For installation of the HG sprockets, use the
special tool (TL-LR15) to tighten the lock ring.
To replace the HG sprockets, use the special
tool (TL-LR15) and TL-SR21
to remove the lock ring.
a
b
1
1
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Y
P
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R
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L
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C
J
A
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A
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S
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4
2
6
8
2
5
9
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0
0
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The groove is
wide at one
place only.
a
c
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1
4
T
A
U mark
Lock ring
The 6 sprockets are secured by
means of rivets.
Tightening torque:
30 - 50 N·m {261 - 434 in. lbs.}
Lock ring
Tool
(TL-SR21)
Disassembly
TL-LR15
This service instruction explains how to use and maintain the Shimano bicycle parts
which have been used on your new bicycle. For any questions regarding your bicycle
or other matters which are not related to Shimano parts, please contact the place of
purchase or the bicycle manufacturer.
Please note: specifications are subject to change for improvement without notice. (English)
© Feb. 2006 by Shimano Inc. XBC SZK Printed in Singapore.
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
SI-0027B-000-00
00
-
1
Shimano CS-HG50-8I Service Instructions
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